Friction and Casing Wear Factor Characterization

BARRETO, JOSE ALBERTO; GRITTINI, SANTIAGO JAVIER; ZAMBETTI, RAFFAELLO; ZARA, EMANUEL MARIANO; TUCKART, WALTER

SPE Latin American and Caribbean Petroleum Engineering Conference Proceedings

Society of Petroleum Engineers (SPE)

Año: 2023

Casing wear is a concern among O&G operators worldwide since it can lead to well integrity issues. Wearcan appear on both elements, drill pipe and the external casing, resulting in the reduction of the tubularwall thickness affecting its performance. To address the topic, a tribometer was developed based on thestandard API STD 7CW (2015), including a rotating element that slides against a fixed element while beingexposed to drilling mud, leading to the obtention of coefficients of friction (CoF) and casing wear factors,for different combinations of Oil Country Tubular Goods (OCTG). To estimate CoF and casing wear factors, more than 70 laboratory tests were performed combining steelgrades under repetitive and consistent conditions. Contact force was fixed and maintained between bothelements during test. CoF were calculated by direct torque measurement, while casing wear factors wereindirectly defined by measuring the material loss volume. Results obtained in CoF were in a range of 0.3 and 0.5, being higher than the values in open literature.They also showed a relation between drill element grades and higher values of CoF. Three zones weredetected when evaluating CoF results together. Analyzing casing wear factors, the results obtained were ina range from 0.03 to 0.3 (1/psi E-09), this range is slightly lower than public data available. Different testingconditions such as torque and displacement were evaluated to assess the behavior of 28Cr alloy.